#include<fstream>
#include<string>
using namespace std;
int i,n,rez,a[2000005],u,lim;
string sir;
char s[2000005];

int main(void){
    ifstream fin("pscpld.in");
    ofstream fout("pscpld.out");
    getline(fin,sir);
    n=sir.length();
    for (i=0; i<n; ++i){ s[2*i+1]=sir[i]; s[2*i]='.'; }
     s[0]='?'; lim=1; u=1;
    a[1]=1; a[2*n-1]=1; rez=2;
    
    for (i=2; i<2*n-1; ++i) {
    
       if (i>lim){
               int lim=i+1; u=i;
               while (s[2*i-lim]==s[lim]) ++lim;
               --lim;
               a[i]=2*(lim-i)+1;
               }
       else {
          int brat=min(lim-i,a[2*u-i]/2+1);  
               
            a[i]=2*brat+1;
            
          if (i+brat==lim) {
             lim=i+brat+1;
              while (s[lim]==s[2*i-lim]) ++lim;
               --lim;
               a[i]+=2*(lim-i)+1;
               }
            }
    
     if (i%2==1) rez+=(a[i]-1)/4+1;
      else { int val=(a[i]-1)/2;
             if (val%2==0) rez+=val/2; else rez+=val/2+1;
             }
             
      }
  fout<<rez;
 return(0);
}